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STMicroelectronics STM8AF6246UCY
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- Part No.:
- STM8AF6246UCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AF6246UCY.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,727
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Product details
Overview
STM8AF6246UCY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 16 Kbyte Flash program memory, 1 Kbyte true data EEPROM, and integrated LINUART, SPI, I²C, 10-bit ADC, and advanced timers. It operates from 3 to 5.5 V and supports ambient temperatures up to 150 °C, targeting engine control units and body electronics modules.
For engineers reviewing the STM8AF6246UCY datasheet, STM8AF6246UCY pinout, STM8AF6246UCY application, or STM8AF6246UCY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade operating parameters, and real-world use cases in high-temperature vehicle subsystems.
Technical Context
The STM8AF6246UCY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, achieving 10 MIPS at 16 MHz. Its clock system includes trimmable 16 MHz HSI and 128 kHz LSI RC oscillators plus external crystal support, all monitored by a dedicated clock security system (CSS).
Interrupt handling uses a nested controller with 32 vectors and up to 34 external interrupts mapped across 5 vectors. Memory subsystem comprises 16 Kbyte Flash (20-year retention at 55 °C), 1 Kbyte EEPROM (300 kcycle endurance), and 2 Kbyte RAM - all accessible via unified addressing with hardware write protection and read-out protection options.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic timing for real-time automotive control loops. |
| Max fCPU | 16 MHz; supports 10 MIPS throughput for time-critical tasks like spark timing or PWM motor control. |
| Flash Memory | 16 Kbyte; retains data ≥20 years at 55 °C after 1,000 erase/write cycles - suitable for field-updatable firmware in harsh environments. |
| Data EEPROM | 1 Kbyte true EEPROM; withstands 300,000 write/erase cycles for logging fault codes or calibration data without external NV memory. |
| ADC Resolution | 10-bit with 2 LSB TUE accuracy and linearity; provides precise sensor signal digitization for throttle position or coolant temperature sensing. |
| Operating Temperature | −40 to +150 °C; certified for under-hood applications including transmission control and exhaust gas recirculation systems. |
| LIN Compliance | LIN 2.2 compliant UART with automatic resynchronization; enables robust single-wire communication with sensors and actuators in distributed automotive networks. |
Pinout & Package
STM8AF6246UCY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with exposed thermal pad. This compact, thermally efficient package supports high-density PCB layouts in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3–5.5 V supply rail; requires local decoupling capacitor per datasheet Section 10.3.1. |
| VSS | Ground reference | Digital ground plane connection; separate analog ground not required due to internal isolation. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts external reset IC or microcontroller-driven reset signaling. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; supports alternate functions including TIM1/2 channels and ADC inputs. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port; includes LINUART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA pins. |
| PC0–PC7 | General-purpose I/O port C | 8-bit bidirectional port; features TIM3/4 channels, beeper output, and additional ADC inputs. |
| PD0–PD7 | General-purpose I/O port D | 8-bit bidirectional port; supports advanced timer complementary outputs with dead-time insertion for motor gate drivers. |
| VCAP | Capacitor connection for internal voltage regulator | Requires 1 µF ceramic capacitor to stabilize internal 1.8 V core supply; critical for EMC robustness and low-power mode stability. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 to +150 °C operation - meets automotive powertrain and chassis system reliability requirements. |
| Hardware LIN 2.2 interface | Integrated LINUART with automatic resynchronization eliminates need for external transceiver in slave-node applications. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time - enables 3-phase motor control without external logic. |
| True data EEPROM | 1 Kbyte on-chip EEPROM with 300 kcycle endurance - replaces external serial EEPROM in battery-backed parameter storage designs. |
| Low-power modes with clock gating | Wait, auto-wakeup, and Halt modes with user-definable peripheral clock gating - reduces current draw to <1 µA in Halt mode with RTC active. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and oxygen sensor signals in gasoline direct injection systems. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection and ignition timing algorithms with sub-millisecond interrupt latency. Use Value: 16 MHz deterministic execution and 10-bit ADC with scan mode enable synchronized sampling of multiple analog sensors during combustion cycle. |
Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror adjustment in premium vehicles. IC Role / Device Role / Timing Role: System coordinator interfacing with LIN slave nodes (e.g., seat controllers, mirror ECUs) via integrated LINUART. Use Value: Hardware LIN compliance and 38-pin I/O count allow direct control of >20 discrete loads while maintaining ISO 11898-3 physical layer robustness. |
| Transmission Control Unit (TCU) | Exhaust Gas Recirculation (EGR) Valve Controller |
Use Scenario: Closed-loop control of solenoid-operated shift valves and torque converter clutch pressure in 6-speed automatic transmissions. IC Role / Device Role / Timing Role: High-reliability actuator driver using TIM1's complementary PWM outputs with dead-time insertion to prevent shoot-through in H-bridge drivers. Use Value: 150 °C rated operation and AEC-Q100 qualification ensure uninterrupted function in oil-cooled transmission control housings. |
Use Scenario: Precision positioning of EGR valve via stepper motor or DC motor based on NOx sensor feedback and engine load conditions. IC Role / Device Role / Timing Role: Sensor fusion node combining ADC readings (coolant temp, manifold pressure) with LIN-sourced upstream O₂ data to compute optimal EGR rate. Use Value: Integrated 10-bit ADC with analog watchdog and 1 Kbyte EEPROM allow on-the-fly calibration updates and fault logging without host processor intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF6266UCY | 32 Kbyte Flash, 2 Kbyte RAM, same peripherals and package; higher memory density. | Required when firmware exceeds 16 Kbyte or additional RAM is needed for complex diagnostics. | Select if future firmware expansion or multi-layer diagnostic stack is planned; pin-compatible drop-in upgrade path. |
| RL78/F13-CD-TPFB | Renesas RL78 core, 32 Kbyte Flash, 2.5–5.5 V supply, −40 to +125 °C rating, no LIN hardware block. | Suitable for non-LIN automotive body applications where CAN or UART-based networking suffices. | Choose when migrating to Renesas ecosystem or requiring lower active current (<120 µA/MHz); requires LIN software stack implementation. |
Compared with STM8AF6266UCY, the STM8AF6246UCY trades Flash/RAM capacity for cost-sensitive ECU variants; versus RL78/F13, it offers native LIN 2.2 support and extended temperature range but lacks ultra-low-power sleep modes below 1 µA.
Availability
STM8AF6246UCY is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply across automotive production lifecycles.
Supply support for STM8AF6246UCY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The STM8A product line targets cost-optimized, high-reliability automotive applications - delivering AEC-Q100 qualified 8-bit performance with integrated LIN, robust I/O, and extended temperature operation for powertrain and chassis systems.
FAQ
What is the maximum junction temperature specification for STM8AF6246UCY?
The device is qualified for operation up to +150 °C ambient temperature and supports junction temperatures up to +165 °C under specified thermal conditions. Thermal resistance θJA is 40 °C/W for the VFQFPN32 package with standard 2-layer PCB layout and 1 cm² copper pour under the exposed pad, as defined in Section 11.4 of the datasheet.
Does STM8AF6246UCY support in-circuit debugging via SWIM interface?
Yes, it features a Single Wire Interface Module (SWIM) supporting full-speed in-circuit debugging, flash programming, and real-time variable inspection using ST-LINK/V2 or compatible debug probes. SWIM operates at up to 2 MHz and requires only one dedicated pin (SWIM) plus VDD and VSS connections.
Can the internal 16 MHz RC oscillator be calibrated for improved accuracy?
Yes, the HSI oscillator supports user trimming via the CLK_HSITRIMR register, allowing ±1% frequency adjustment in 0.5% steps. Factory-trimmed default accuracy is ±2% over temperature, and trimming can achieve ±0.5% accuracy when referenced to an external crystal or LIN bus timing frame.
How many LIN nodes can STM8AF6246UCY manage simultaneously in a network?
The integrated LINUART supports only one physical LIN bus interface, but the device can operate as either master or slave node. As a master, it controls up to 16 slave nodes per LIN cluster; as a slave, it responds to commands from one master. Multiple clusters require external LIN transceivers or multiplexing via GPIO-controlled bus switches.
STM8AF6246UCY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 25
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 512 x 8
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 7x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6246UCY FAQ
1.How can I place an order for STM8AF6246UCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246UCY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM8AF6246UCY reliable?
The price and inventory of STM8AF6246UCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246UCY is usually 5 days.
3.What payment methods are accepted for STM8AF6246UCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246UCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246UCY?
STM8AF6246UCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246UCY order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM8AF6246UCY?
For technical support, including STM8AF6246UCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246UCY requirements.
6.How does Aetrix verify that STM8AF6246UCY is sourced from the original manufacturer or authorized distributors?
All STM8AF6246UCY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM8AF6246UCY meets industry standards.
7.What is the process for return or replacement of STM8AF6246UCY?
All STM8AF6246UCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246UCY, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM8AF6246UCY part is unused and in its original packaging.
Return procedure for STM8AF6246UCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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